Refactor localization files and remove Aliyun references

qwen3-tts-backend/main.py

@@ -233,12 +233,6 @@ async def health_check_details(current_user: User = Depends(get_current_user)):
             backends_status["local"] = local_health
         except Exception as e:
             backends_status["local"] = {"available": False, "error": str(e)}
-
-        backends_status["aliyun"] = {
-            "available": True,
-            "region": settings.ALIYUN_REGION,
-            "note": "Requires user API key configuration"
-        }
     except Exception as e:
         logger.error(f"Backend health check failed: {e}")
         backends_status = {"error": str(e)}